Pregnant Woman - Suggestions (no pic)

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I have the opportunity to photography a friend of mine who is pregnant. She is due in February and I will be doing the shoot sometime in january. She has a 2 year old daughter so I was thinking of a nice belly shot with her daughter putting her hand on her belly.

Has anyone taken pictures of pregnant women? Any suggestions/tips would be appreciated. Even better if you could post some examples.

Thanks,
Tim